Latticelike stiffening ribbing for structural plates



LATTICE-LIKE STIFFENING RIBBI NG FOR STRUCTURAL PLATES Filed larch 11, 1942 2 Sheets-Sheet 1 iNvs/vroa 3035f HORVATH By MM- ATTORNHL- Patented Aug. 31, 1943 PATENT OFFICE LATTICELIKE STIFFENING RIBBTNG FOR STRUCTURAL PLATES Josef Horvath, Budapest, Hungary; vested in the Alien Property Custodian Application March 11, 1942, Serial No. 434,300 In Hungary March 12, 1941 wood sheets. e. g. of veneering wood glued together in sheets and, respectively, doors, furnitures, side walls, etc. show the disadvantage in general to change the shape, distort or get warped after drying up of the wood. 'fThe'reason of this warping isthat the stiffening ofjthe wood plate is nota perfect one so that upon drying the appearing forces work and change the shape of the insufilciently stifiened plate. I

The plates provided with lattice-like stiffening ribbing according to the invention overcome en- Said plates kee'ptheir tirely these drawbacks. correct shape also after drying up and do not warp. Owing to their perfect stiffening the,

strength of these plates is much greater than that of the known wood-plates. A special advantage is further that by means of the latticelike stiiiening ribbing not only even plates, sheets and wood-constructions, but also such of any curvature can be produced, so that the same can be used advantageously in furniture making and in carpentry work for the production of furniture," doors, wood-constructions and equipments of the besides its great strength and stability the lat-*1 tice-like stiffening ribbing is much lighter in weight than similar wood-plates of the type used up to the present, moreover it ensures a great saving in material what is very remarkable frommost various shape. A further. advantage is that economic views.

The lattice-like stifiening ribbing according to the invention consists of a plank, divided by splitting or sawing in a mechanical way or by hand in fillets parallel to each other and being coherent with each other on one or more places, said fillets being pulled asunder into a. length corresponding to the size of the wood-plate wanted and being framed in a convenient fixing side frame. On the lower and upper side of the coherent ribbing formed in this manner plates, e. g. wood-plates, sheeted glued wood-plates (veneerplates) are fastened in a suitable manner, e. g. by gluing. The ribbing can be made not only from a one-piece wood-plate, but also from individual fillets of wood Joined together and fastened in places to each other e. g. by gluing, said fillets being pulled asunder after drying into the desired size, then fixed in a side frame and covered by veneer-plates.

The wood-plate made in this manner can also be applied very useful in the building art for doors, structural-plates, etc. as the same are light in weight, strong, not liable to warp and fill out the door-frame also after drying. In this kind of wood-plates provided with the lattice like stiffening ribbing, openings e. g. for windows can be cut afterwards in a simple and easy manner,

wherein window-frames can be set.

In the accompanying drawings embodiments of [the invention are shown by way of example.

Fig. 1 is a plan view of a part of the lattice-1ike stiffening ribbing, made in one piece. a Fig. 2 is-the same in the pulled asunder posi tion, framed in a side-frame.

Fig. 3 is'a plan view of a part of another em bodiment ofthe' ribbing,

Fig.4jis-the same in the pulled asunder posi 'tion framed in a side-frame. Fig. 5 is a sectional view along the line V-V of Fig. 2 with covering sheets.

Fig. 6 is a sectional view along the line II-VI of Fig. 2 with covering sheets.

, Fig.7 is a cross-sectional view of a wood plate of arched shape.

Fig. 8 is a cross-sectional view of a wood-plate of double-arched shape. Fig. 9 is a perspective View of a wood-plate of truncated cone surface shape.

In the embodiment of the invention according of a plank l in such a manner that said plank is split by means of cuts or sawings 2 starting from a both opposite edges 3, 4 of the plank into fillets 3 or bars 5. The cuts 2 do not extend through the whole width of the plank I, so that the fillets 5 remain on certain places coherent with each other. The plank I will then be stretched by pulling asunder in the direction indicated by the arrows A, B, whereby the fillets 5 because of their elasticity withdraw from each other and open like a bellows, thus'forming a coherent ribbing according to Fig. 2. In order to fix this ribbing in its pulled asunder position a fixing frame is used having side bars I, 8 provided with excavations 6 and being fixed to both side parts of the stiffening ribbing.

To the upper and lower part of the framed stiffening ribbing a sheet-cover 9, ID, e. g. a sheetwise glued wood-plate is fixed in any convenient manner, e. g. by gluing (Figs. 5 and 6). The covering sheets with the stiffening ribbing between them form an entirely stiffened strong non-warping plate, which may be used for several purposes.

In the embodiment of the invention according to Figs. 3 and 4 the wood-plank I is divided into slices or fillets I4 partly by cuts ll starting from the side-edges 3, 4 of the plank, partly by further cuts I3 applied in the line of the two 0pposite cuts I I, between them, said slices or fillets to Figs. 1 and 2 the stiffening ribbin is formed remaining, however, at certain places connected with each-other. By pulling asunder the plank cut in this manner, in the direction of the arrows C, D, a coherent stiffening ribbing according to Fig. 4 is obtained. This ribbing is fixed in its stretched position on both sides, as in the case of the embodiment described before, by means of the side bars I, 8. On both sides of this ribbing are in the same manner as described before, covering sheets, wood plates, fastened, e. g. glued.

By means of this stiffening ribbing not only even plates, but also curved surfaces of any curvature can be produced.

In the embodiment of Fig.7 the covering sheets [5, iii are glued on the fillets 5 of the stiilening ribbing which is bent into semi-circular shape or in the form of a cylindrical surface so that a wood-plate of half cylindrical form and of annular cross-section is obtained.

In the embodiment according to Fig. 8 the stiffening ribbing is double-bent and then covered with sheets ll, [8. I

The Wood-plate [9 of truncated cone hape according to Fig. 9 is made by pulling asunder the stiifening' ribbing formed by the fillets 5 on one side more than on the other, bending it in this position in arched form and covering it afterwards by sheets. The fillets or bars 5 may be made not only as a coherent piece by cutting in of a solid plank, but also by making individual fillets, placing the same side by side and fastening them together on suitable places a. by gluing. After drying the ribbing is pulled asunder into the shape shown in Fig. 2 or Fig. 4, respectively and fixed by framing.

The stiffening ribbing according to the invention may be made not only of wood, but also of other suitable material and it may be used for many different purposes. So, e. g. a wood-plank, to which a continuous forward movement is imparted, can be provided along its full length mechanically by sawing with cuts so that it can be stretched by pulling asunder transversely to the direction of the cuts and in this manner the stiffening ribbing can be produced in planklengths for storing purposes as a goods of trade from Which the wanted lengths can always be cut more, so that in comparison with the wood-plates provided with solid stiffening fillers used up to the present very considerable savings in material can be attained. Very wide plates of big sizes can be made of several ribbings placed side by side, the adjacent branches of the ribbings being clamped in or connected with each other, so that the ribbing will not be liable to shrink in the middle part, Whereas on the borders the fillets will be held by the framing bars I. 8. These bars 1, 8 may at the same time also form parts of the frame of the plates (e. g. door-plates, furniture side-walls, etc.) built up of the ribbing according to the invention. The stiffening ribbing may be arranged in the length of the plate as well as in transversal direction.

The stiffening ribbing may be made not only of wood, but also of metal, paper, textile material and of artificial material, that is to say of all kinds of material which can be split or sawn in and then, owing to its flexibility or elasticity can be stretched by pulling asunder transversely to the cuts. Likely, sheets of various material may be used as covering sheets of the stiffening ribbing.

As the stiffening ribbing made by cutting or sawing in and stretched by pulling asunder can be very well bent, the most various kind of shaped structural elements of buildings or furnitures (e. g. curved furniture side-walls, curved doors, etc.) may be produced-,the bent stiffening ribbing being very strong and stiffen after covering with sheets.

One manner of making the lattice-like ribbing for structural plates made of sheets according to the invention consists in slitting or sawing in a solid plank at places in rows parallel to eachother. Another manner consists in making the ribbing of individual fillets or bars placing them side by side and fastening them at places together, e. g. by gluing.

What I claim is:

In a ply wood panel, a lattice-work core having two side bars provided with recesses, an end bar provided with projections to seat on said side bars, a series of interconnected ribs having their ends seated in the recesses of said side bars, the end bar and ribs being integral and formed from a single plate of wood, partially severed by slits, and expanded to form a lattice work, the recesses in the side bars retaining the ribs in their expanded position.

JOSEF HoRvATH. 

